Use of Modified Zeolites for the Remediation of Waters and Cultivated Soils from Cu(II)

Ioannou, Z.; Papapostolou, T.; Georgoulas, N.; Dimirkou, A.

doi:10.1007/s11270-012-1320-4

Cited by 6 publications

(2 citation statements)

References 28 publications

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“…- [27]. Furthermore, at pH 10 there is a strong competition between OH − and Br − or chromate anion for the sorption sites of Z1 since more OH − anions are present at high pH leading to the lower affinity of Cr (VI) sorption.…”

Section: Results and Conclusionmentioning

confidence: 99%

Removal of Cr (VI) and Cr (III) From Polluted Water and Soil Sown with Beet (Beta Vulgaris) or Celery (Apium Graveolens) after the Addition of Modified Zeolites

Brozou¹,

Ioannou²,

Dimirkou³

2018

Int J Waste Resour

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Clinoptilolite, which was modified with hexadecyltrimethylammonium-bromide solution (HDTMA-Br) in a proportion of 1/8 w/v (Ζ1), was applied for the adsorption of chromate anions from aqueous solutions. Different initial concentrations of chromate anions from 0 to 145 ppm were added as K 2 Cr 2 O 7 to 1 g of modified zeolite adsorbent. Zeolite (clinoptilolite, Z) was also used for comparison reasons. The kinetic analysis of both adsorbents (Z, Z1) was studied at 25°C. Equilibrium isotherms of chromate anions were studied for clinoptilolite and modified zeolite at 25, 40 and 60°C. According to the kinetic analysis, the chromate anions adsorption capacity reached at 1115.10 mg Cr (VI)/kg adsorbent for Z1 and 35.05 mg Cr (VI) kg for Z. According to isotherms, the adsorption of Cr (VI) on Z1 and Z did not increase with the increase of temperature indicating that the whole adsorption mechanism is controlled by chemisorption and not by physical adsorption. Modified zeolite and zeolite were tested to two different soils, i.e. a soil amendments. The modification of clinoptilolite with HDTMA-Br leads to the creation of positively charged surface sites of zeolite increasing the adsorption of Cr (VI) as chromate anions. Such adsorbents can be applied for the removal of heavy metals and dyes in an anionic form from wastewater and soil solutions where negative charged sites of clinoptilolite present low adsorption capacity.

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Section: Results and Conclusionmentioning

confidence: 99%

Removal of Cr (VI) and Cr (III) From Polluted Water and Soil Sown with Beet (Beta Vulgaris) or Celery (Apium Graveolens) after the Addition of Modified Zeolites

Brozou¹,

Ioannou²,

Dimirkou³

2018

Int J Waste Resour

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“…As zeólitas são aluminossilicatos hidratados de metais alcalinos e alcalinos terrosos, formada por tetraedros de SiO 2 e Al 2 O 3 onde o desbalanceamento de cargas dada pela substituição isomórfica do Si +4 pelo Al +3 gera um déficit de carga positiva, as quais são compensadas por cátions (principalmente Na + , K + , Ca +2 ou Mg +2 ) [9][10][11]. Apresentam alta porosidade, estrutura microporosa e área superficial específica devido à sua estrutura [12]. As propriedades de adsorção das zeólitas resultam de sua grande capacidade de troca iônica.…”

Section: Introductionunclassified

Efeito do pH na capacidade máxima de remoção de cobre por zeólita natural

et al. 2017

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RESUMO Zeólitas naturais são materiais adsorventes eficientes e com baixo custo para remoção de metais pesados em relação aos métodos convencionais. Este trabalho teve como objetivo avaliar o efeito do pH na capacidade máxima de remoção de cobre (Cu+2) por zeólita natural disponível na região do planalto catarinense (zeólita basalto - ZB) comparando sua eficiência com uma zeólita comercial importada de cuba (ZC). A capacidade de troca de cátions das zeólitas foi determinada pelo método de saturação por amônio. A densidade de partículas foi feita através do método do balão volumétrico. O efeito do pH na remoção foi avaliado a pH 3,0; 4,0 e 5,0 (±0,2) e concentrações iniciais de 10 mg L−1 e 180 mg L−1. A capacidade máxima de remoção de Cu+2 foi avaliada em pH 3,0; 4,0 e 5,0 e concentrações iniciais de 10, 30, 60, 90, 180 e 270 mg L−1. A quantificação do teor de Cu+2 foi realizada por espectrofotometria de absorção atômica com sistema de atomização por chama do tipo ar-acetileno. Para a construção das isotermas foi utilizado regressão polinomial e no teste de médias da porcentagem removida de Cu+2 em diferentes valores de pH foi utilizado Scott-Knott a 5% de significância. A ZC apresentou capacidade de troca de cátions 40% superior a ZB, porém isso não se refletiu na capacidade de remoção. Houve efeito do pH somente para ZC na menor concentração adicionada. A capacidade máxima de remoção foi de 2662 mg kg−1 para ZB e 2759 mg kg−1 para ZC em pH 5,0. A capacidade máxima de remoção de Cu+2 para ZB é semelhante ao da ZC. A ZB pode ser utilizada na remoção de metais em efluentes industriais e laboratoriais com baixo custo.

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Removal of Chromium from Soils Cultivated with Maize (Zea Mays) After the Addition of Natural Minerals as Soil Amendments

Molla

Ioannou

Mollas

et al. 2017

Bull Environ Contam Toxicol

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The efficiency of natural minerals, i.e. zeolite, bentonite and goethite, regarding the retention of chromium, from maize was examined. Specifically, 1.0 kg of soil, 1.0 g of soil amendment and either 50 mg L Cr(III) or 1 mg L Cr(VI) were added in plant pots. Then, seeds of maize were cultivated. Each treatment was repeated three times. The statistical results of the experiments were analyzed by LSD test. Cr(III) addition in soil has shown that zeolite was the only amendment that increased the dry weight. Zeolite and bentonite reduced significantly the total chromium in plants after the addition of 50 mg L Cr(III). The addition of Cr(VI) in soil has shown that bentonite was the only amendment that increased the dry weight of biomass and the plants' height. All soil amendments reduced to zero the total chromium concentration measured to plants after the addition of 1 mg L Cr(VI).

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Use of Modified Zeolites for the Remediation of Waters and Cultivated Soils from Cu(II)

Cited by 6 publications

References 28 publications

Removal of Cr (VI) and Cr (III) From Polluted Water and Soil Sown with Beet (Beta Vulgaris) or Celery (Apium Graveolens) after the Addition of Modified Zeolites

Removal of Cr (VI) and Cr (III) From Polluted Water and Soil Sown with Beet (Beta Vulgaris) or Celery (Apium Graveolens) after the Addition of Modified Zeolites

Efeito do pH na capacidade máxima de remoção de cobre por zeólita natural

Removal of Chromium from Soils Cultivated with Maize (Zea Mays) After the Addition of Natural Minerals as Soil Amendments

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